diff --git a/wgmaster/migrate.py b/wgmaster/migrate.py
index e18c9a5..3cf821c 100755
--- a/wgmaster/migrate.py
+++ b/wgmaster/migrate.py
@@ -1369,9 +1369,10 @@ def migrate_deliveries(in_dir: str, out_dir: str) -> None:
                 if comment:
                     comments.append(comment)
 
+                gerebelt = True if WG == 'MATZEN' else d['Gerebelt'] or False
                 f_part.row(
                     date.year, snr, dpnr, sortid, int(d['Gewicht']), kmw, qualid, hkid, kgnr, rdnr,
-                    d['Gerebelt'] or False, d['Handwiegung'] or False, d['Spaetlese-Ueberpruefung'] or False,
+                    gerebelt, d['Handwiegung'] or False, d['Spaetlese-Ueberpruefung'] or False,
                     hand, lesemaschine, d['Temperatur'], acid, scale_id, weighing_id, comment
                 )
                 for attrid in attributes: